As far as I remember/ know about you five different options.
1.(most expensive, little work, best looking) Get yourself some sort of single speed chain tensioner, such as this one from surly:
http://www.bikebling.com/ProductDeta...rly-Singleator
2.(little bit more work, less clean looking, free) remove the limit screws from your derailer, and shorten your chain to where the derailer is pulled as tight(horizontal) as you can get it, making your two pulley derailer work like the chain tentioner
3.(most work, more clean looking than 2, very cheap) get longer limit screws for your derailer, play with it till you get a traditional looking derailer set up that holds your chain tight.
4.(most expensive, super clean looking, a bit of work) Buy a white industries Eccentric hub.
5.(cheap, lots of work, doesnt really work that great) Eric House's magic ration may work, I have had very mixed results
http://eehouse.org/fixin/fixmeup.php
As for the road type skewer, it will work just fine if you use it right. You may want to invest in a higher end aftermarket skewer but for a single speed I dont know if it would be worth it.